Have a LF Happy foil and happy pill board.
Having too much problem getting board on edge to waterstart.
Wearing me out! Just too weak and/or old!!
Appreciate any suggestions as to which foil setups are basically "neutral buoyant" so that foil more or less sits on water when starting.

I can share my experience, will avoid mentioning brands. I started on an aluminium foil (maybe that was a particularly heavy one, have not tried others) and I hated how heavy it was and how hard each waterstart was. Then I had an opportunity to buy a used carbon setup for a good price so I switched to that. The difference was like night and day. Although carbon still sinks, it is very easy to hold, feels like a feather in comparison to my first setup.

A friend let me use his Ketos with pocket board. It’s the nicest setup I’ve used.

My foil is Levitaz and the SS fuselage is a big ballast that rights the foil even more than Alu setups I have tried. When using a volume board there is some work to put it on its side. A thin board reduces the righting moment by allowing the rail to sink. With a skin board (crazy fly chill deck proto) I can waterstart without my hands on the board. I just lay my feet on the board and use the water pressure against downwind movement to put the foil in start position.

If you swap the fuselage to carbon, it would alleviate the LF sinking problem. I have made 350g fuselage, and the foil become much nicer. With those standard 1200 g grossly overbuilt alum fuselages I wonder how competent the designers were.

Can also only recommend the Ketos foils, as they sit quite long "heeled over", all of them.

Especially the "Surf" wing is amazing and even more floaty because of its size - they have had it for over a year now as a SUP wing, KF660-1200, but we are many using it as the perfect surf (kite) wing - so now it will come in a direct "kite" wing with only 2 holes.

Yah the carbon fuselage makes a big difference with the liquid force foil set. Also the Impluse wings add a lot of float.
But the best advice I can give is get a board with less volume so you can sink the edge. This will help you water launch with much less effort then the 20L+ boards which you really need to leverage to get on their edge.